// Module 6: Grid, lexer and parser. Each test matches a heading in scenarios.md.
import { expect, test } from "vitest";
import { newBaba, type Baba } from "../src/harness";

/** An empty level `width` wide and `height` high. */
const emptyLevel = (width: number, height: number) => ({ width, height, objects: [] });

/** Place one text object per word: `[word, x, y]`. */
function write(b: Baba, words: [string, number, number][]): void {
  for (const [word, x, y] of words) b.place(`text:${word}`, x, y);
}

test("test_06_horizontal_rule", () => {
  const b = newBaba({
    width: 5,
    height: 3,
    objects: [
      { kind: "text:BABA", x: 0, y: 0 },
      { kind: "text:IS", x: 1, y: 0 },
      { kind: "text:YOU", x: 2, y: 0 },
      { kind: "baba", x: 3, y: 2 },
      { kind: "text:YOU", x: 0, y: 2 },
      { kind: "text:IS", x: 1, y: 2 },
      { kind: "text:FLAG", x: 2, y: 2 },
    ],
  });

  expect(b.rules()).toEqual(["BABA IS YOU", "TEXT IS PUSH"]);
});

test("test_06_crossword_shared_is", () => {
  const b = newBaba(emptyLevel(3, 3));
  write(b, [
    ["BABA", 0, 1],
    ["IS", 1, 1],
    ["YOU", 2, 1],
    ["FLAG", 1, 0],
  ]);

  expect(b.rules()).toEqual(["BABA IS YOU", "TEXT IS PUSH"]);

  b.place("text:WIN", 1, 2);

  expect(b.rules()).toEqual(["BABA IS YOU", "FLAG IS WIN", "TEXT IS PUSH"]);
});

test("test_06_and_distributes", () => {
  const b = newBaba(emptyLevel(7, 1));
  write(b, [
    ["BABA", 0, 0],
    ["AND", 1, 0],
    ["ROCK", 2, 0],
    ["IS", 3, 0],
    ["PUSH", 4, 0],
    ["AND", 5, 0],
    ["STOP", 6, 0],
  ]);

  expect(b.rules()).toEqual(["BABA IS PUSH", "BABA IS STOP", "ROCK IS PUSH", "ROCK IS STOP", "TEXT IS PUSH"]);
});

test("test_06_stacked_text_all_combinations", () => {
  const b = newBaba(emptyLevel(3, 1));
  write(b, [
    ["BABA", 0, 0],
    ["ROCK", 0, 0],
    ["IS", 1, 0],
    ["YOU", 2, 0],
  ]);

  expect(b.rules()).toEqual(["BABA IS YOU", "ROCK IS YOU", "TEXT IS PUSH"]);
});

test("test_06_default_text_is_push", () => {
  const b = newBaba({ width: 3, height: 3, objects: [{ kind: "baba", x: 1, y: 1 }] });

  expect(b.rules()).toEqual(["TEXT IS PUSH"]);
});